P routers have no knowledge of the customer prefixes, they just Label switch the packets based on their LFIB
Here is a scenrio,
(1.1.1.0)CE1-PE1-P-PE2-CE2(2.2.2.0)
P router has no customer routes in its routing table, since it is not participating in iBGP.. thats perfect....
but P routers are meant to label switch packets between CE-1 & CE-2 through PE1 & PE2.. but i cannot see any labels for customer routes in P LFIB:
/* Style Definitions */
table.MsoNormalTable
{mso-style-name:"Table Normal";
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-qformat:yes;
mso-style-parent:"";
mso-padding-alt:0in 5.4pt 0in 5.4pt;
mso-para-margin-top:0in;
mso-para-margin-right:0in;
mso-para-margin-bottom:10.0pt;
mso-para-margin-left:0in;
line-height:115%;
mso-pagination:widow-orphan;
font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;
mso-hansi-font-family:Calibri;
mso-hansi-theme-font:minor-latin;}
P#sh mpls for
Local Outgoing Prefix Bytes tag Outgoing Next Hop
tag tag or VC or Tunnel Id switched interface
16 Pop tag 10.10.10.11/32 6703 Se0/1 point2point
17 Pop tag 10.10.10.10/32 2140 Se0/0 point2point
Hi Mukarramjahraheel
You are right . P will not participating in iBGP. He is not aware of any Customer router of BGP VPNv4 route..
P Router know only internal IGP. Please go through the below points.
The JOB of Core router is to propogate the route As Fast As Possible without delay.
Don't Get confuse in MPLS . MPLS is used for only Fast switching . Whouth MPLS also you can RUN VRF kown as VRF - Lite , BGP - AF & use CEF for fast switching.
Before Going Further Please check you Design = Whether You want to Create Full Mesh IBGP or Go With BGP Route Reflector.
Communication from CE to PE
PE routers translate into VPN-V4 route
Assigns an RD, SOO (if configured) and RT based on configuration
Re-writes Next-Hop attribute (to PE loopback ) -- When PE Re-Write the Next HOP , That next hop will IBGP VPNv4 Neighbore PE and that is reachable through internal IGP. MPLS work only for Internal IGP to forward the packet AFAP without delay .
Assigns a label based on VRF and/or interface
Sends MP-BGP update to all PE neighbors
Receiving PE routers translate to IPv4Insert the route into the VRF identified by the RT
attribute (based on PE configuration)The label associated to the VPN-V4 address will be set onpackets forwarded towards the destination
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